Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
  • B60C13/02—Arrangement of grooves or ribs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/03—Tread patterns
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/02—Seating or securing beads on rims
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/02—Carcasses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/03—Tread patterns
  • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
  • B60C2011/0339—Grooves
  • B60C2011/0341—Circumferential grooves

Definitions

• the invention relates to radial carcass or cross-carcass tires.
• the main parts of a tire are the tread, the sidewalls and the beads.
• the beads are intended to come into contact with the rim.
• each of the main parts constituting the tire namely the tread, the sidewalls and the beads, has functions well separated from each other, and therefore has a specific constitution well known.
• the radial tire is substantially reinforced by a carcass reinforcement comprising at least one carcass ply having an angle substantially equal to 90 ° with respect to the circumferential direction of the tire.
• This carcass reinforcement is surmounted radially on the outside, and under the tread, reinforcing plies forming a belt.
• the cross-carcass tire is distinguished from a tire of radial technology by the presence of at least two crossed carcass plies whose angle is different from 90 ° with respect to the circumferential direction of the tire.
• Tablecloths are said to be “crossed” because the angles are of opposite signs from one tablecloth to another. It is recalled that, according to the invention, the circumferential direction of the tire is the direction in a plane perpendicular to the axis of rotation of the tire and tangent to the belt reinforcement of the tire,
• the tread in contact directly with the ground, has a particular function to ensure contact with the road and must adapt to the shape of the ground.
• the flanks meanwhile, absorb the irregularities of the ground while transmitting the mechanical forces necessary to carry the load of the vehicle and ensure its movement.
• the belt reinforcement is an armature which must, on the one hand, be sufficiently rigid vis-à-vis the edge deformations so that the tire develops the drift thrusts necessary for its guidance, and transmit the engine torque or braking, and secondly, be very flexible in bending, that is to say allow variations in curvature of its plane to ensure a contact surface of the tire on the ground sufficient.
• the belt reinforcement generally has a composite structure, allowing it to have the required rigidity for a relatively low weight.
• the belt reinforcement generally consists of at least two plies with different angles, including reinforcements, cable-shaped, coated with rubber.
• the reinforcing elements are crossed from one sheet to the other with respect to the circumferential direction and are symmetrical or not with respect to this direction.
• radial or meridian plane means a plane which contains the axis of rotation of the tire.
• JP2008068716 A tire comprising flanks with external reinforcements, intended to reduce the internal temperature in the tire where deterioration can occur with use.
• JP2003 237317 a tire comprising discontinuous portions of elastomeric gum having different stiffnesses, and disposed on the sidewalls so as to reduce the noise inherent in its operation.
• the patent FR888 453 also describes pneumatic envelopes whose two sides comprise elastomeric rubber projections intended to verify that the pressure of the tire is consistent with the load due to the geometric shape they have.
• US2 354 715 discloses the presence of elastomeric gum growths comprising metal elements, and disposed on the ends of the tread of a tire intended to prevent slippage during travel.
• the invention therefore relates to a tire for a wheel assembly comprising a rim and a tire, said tire comprising at least one carcass reinforcement radially outwardly surmounted by a crown reinforcement, which is itself radially aligned.
• a crown reinforcement consisting of at least a layer of reinforcing elements, said tread being connected to two beads by means of two sidewalls, said beads being intended to come into contact with a rim having rim hook tops, each bead having at least one circumferential reinforcing element, said flanks having, on their outer surface, a series of alternating protuberances with recesses, said tread comprising at least one axially outermost end a circumferential groove.
• each protuberance is disposed on the surface of a sidewall, the various protuberances being arranged in a regular or irregular manner, and continuously, between a point A and a point E, said point A being disposed at the intersection of the radially outer surface of the tread and the sidewall, and a radial axis ZZ 'distant from the equatorial plane AA' of a length L A of between 1 ⁇ 2 (L-85mm) and 1 ⁇ 2 (L-10mm), where L is the nominal flange size, and said point E is disposed, optionally, in a radius comprised in: o R 2 ⁇ E ⁇ (0.75 Ri + 0.25R 2 ), R 2 being the radius of the top of the rim hook and Ri being the radius of the nominal coil size - (Interval I), or in 0.95Ri ⁇ E ⁇ (0.75R A + 0.25 Ri), Ri being the radius of the nominal coil size, and R A being the radius of point A (Interval II),
• does not interrupt is meant that the radially upper end of a protuberance is either adjacent to the circumferential groove, or distant a distance “d” substantially disposed in a radial direction and between 2 and 10mm.
• partially interrupts is meant that the radially upper end of a protuberance partially intersects the circumferential groove.
• this interruption is performed between 2 and 97% of the total axial gap of said groove, preferably between 20 and 80%, and more preferably between 30 and 50%>.
• the groove is an area of a given width located around the point A, and having a longitudinal void ratio greater than 70%>.
• the protuberances arranged between the points A-B and C-D are arranged in an offset manner in two parallel radial directions without symmetry and non-uniform manner.
• the radius R A is a function of the length L A , itself a function of the length L.
• R 1 can be in the range between (0.8R 2 + 0.2R A ) and (0.2R 2 + 0.8R A ).
• the nominal flange size L is defined by the coil size of a tire mounted on the rim and inflated; the flange size being, according to the invention, the distance between the outside of the flanks of an inflated tire, by incorporating the relief of flank surface.
• R ⁇ is the radius of the point on the outer surface of the flank furthest from the median plane.
• the tire according to the invention has the advantage of being quick and easy to achieve, and to withstand particularly violent side shocks without creating significant damage that may possibly cause significant risks to the vehicle passengers.
• the tire according to the invention also has the advantage of having overall performance, such as rolling resistance, wear, endurance similar to that of tires without protuberances on the sidewall.
• Another object of the invention is a mounted assembly comprising a rim and the tire as described above.
• At least one protuberance has a height and a length, said height being optimal in the center of said length of said protuberance.
• the height of a protuberance is minimal at the level of the nominal flange size.
• At least two protuberances have a length different from each other.
• each protuberance has a mean height between
• each protuberance has an average width of between
• the average height of each protuberance may be between 5 and 8mm.
• the protuberances may have an average height greater than 80% of the maximum height over at least 80% of the distance between points A and E. mean height as the average of the height between the ends of a protuberance.
• the protuberances preferably have a rake angle of less than or equal to 20 °, and preferably between 5 and 8 °.
• Two adjacent protuberances may be spaced from each other by an average distance less than or equal to 2 times the average width of a protrusion, and may be substantially parallel to each other.
• the protuberances preferably cover at least 40% of the total circumferential surface of the flank between points A and E.
• Each protuberance may comprise a neutral fiber, passing through a radially innermost end and a radially outermost end, and having an angle ⁇ , with respect to the radial direction ZZ ' between -60 ° and + 60 °.
• the outer sidewall of the tire (that is to say outside when mounted on the vehicle) and the inner side of the tire (that is to say inside when mounted on the tire). vehicle) may comprise each of the protuberances in any combination of possible inclinations.
• the four tires of a vehicle may have variable inclinations depending on each axle and / or on the same axle.
• the hollow between two adjacent protuberances extends axially in the extension of the hollow of a circumferential groove of the tread passing through the point A, said groove being disposed on at least one axial end of the tread. tread.
• the hollow between two adjacent protuberances has an angle, with the circumferential direction between -15 ° and + 15 ° in an area of the sidewall close to the point A, that is to say between 3 and 8 mm.
• the sum of the widths, which may be variable, of each protuberance, in the circumferential direction is greater than or equal to 60 % of the total circumferential length, said length being measured at the location of the protuberances.
• the tire according to the invention may have a ratio [sum of the total widths of each protuberance] / 2 ⁇ greater than or equal to 30%>, and more preferably equal to 60%>, the widths of each protuberance being defined at 50. %) of the total height of said protuberance and for any radius R of the tire in the range R E ⁇ R ⁇ R a with R a the radius of the point A and RE the radius of the point E.
• the protuberance may be present over the entire circumferential length of the tire sidewall.
• the protuberances present on the sidewalls according to the invention consist of a material identical to that of the sidewalls.
• FIG. 1 is a schematic representation of the section of a tire of the invention in a radial plane;
• FIGS. 2A and 2B show schematically and in three dimensions a portion of a sidewall and the corresponding tread of a tire according to the invention,
• FIG. 3 schematically represents an enlarged portion of a sidewall comprising protuberances of a tire according to the invention
• FIG. 4 represents a sectional view, of two adjacent protuberances of a tire according to the invention, along the axis AA of FIG. 3,
• FIGS. 5A and 5B show, in a first variant, a portion of a radially outer portion of a sidewall and the corresponding tread in three dimensions of a tire according to the invention
• FIG. 6A shows, in a second variant, a portion of a radially outer portion of a sidewall and the corresponding tread in three dimensions, some protuberance completely interrupts a circumferential groove of a tire according to l invention
• FIG. 6B shows, in another variant, a portion of a radially outer portion of a sidewall and the corresponding tread in three dimensions, some protuberance partially interrupts a circumferential groove of a pneumatic according to the invention
• FIG. 7A represents a partial view in radial section of part of a sidewall and a part of the corresponding tread according to another variant
• FIG. 7B shows a partial radial sectional view of a portion of a sidewall and a portion of the corresponding tread according to another variant of a tire according to the invention
• - Figure 8 shows schematically and in three dimensions, a portion of a sidewall and the corresponding bead of a tire according to the invention.
• the general-purpose passenger car tire 1 comprises a radially inner carcass reinforcement 2 to a general reference belt reinforcement 3, said belt reinforcement 3 being radially interior to a strip of reinforcement.
• bearing 4 itself connected to two beads 5 via two sidewalls 6.
• the beads 5 are intended to come into contact with a rim 7 (partially shown).
• Each bead comprises at least one circumferential reinforcing element 7a.
• the flanks comprise, on their surface, a series of protuberances 8 regularly alternating with recesses 9 (shown in FIG. 2).
• a protrusion 8 in section, having a continuous neutral fiber. It is recalled here that a neutral fiber is called a neutral axis which passes substantially in the center of the volume of each protuberance, and which undergoes neither shortening nor elongation when it is subjected to compression and / or depression.
• the protuberances 8 are disposed at the surface of the sidewall, a continuous neutral fiber length which extends from a point A to a point E.
• the point E is disposed at a radius less than (0.75Ri + 0.25R 2 ).
• Ri is the radius of the nominal flange size L, and R A is the radius of the point A.
• the point E is disposed at a radius of 232mm for a reference tire 205/55 R 16 mounted on the rim 6.5 J 16 for which RA is equal to 298mm, R 2 is equal to 220mm and Ri is equal to 261mm.
• the definition according to the invention of the coil size is adaptable to any type of envelope combined with any type of rim.
• the point A is disposed at the intersection of the radially outer surface of the tread and the sidewall, and an axis ZZ 'distant from the equatorial plane AA' of a length L A equal to 1 ⁇ 2 (L - 45mm).
• R 16 RA is equal to 298mm.
• the protuberances are not inserted rubber elements, added in the rubber flanks, but are obtained by molding during the firing step. They are obtained in a manner similar to that of the sculptures made on the tread.
• FIG. 2A represents an alternation of protuberances 8 and recesses 9, shown enlarged in FIGS. 3 and 4.
• FIG. 2B represents a variant of FIG. 2A in which the protuberances are arranged at an angle to the axial direction.
• the longest continuous protuberances 8 have a neutral fiber length of about 75 mm for a tire of dimension 205/55 R 16. They are arranged radially (FIG. 2) substantially parallel to one another others, are spaced about 4.50mm, have a height of about 6mm, and a width of about 8.6mm in their axially innermost part.
• the relief angle ⁇ is about 8 °.
• the protuberances have a ratio [sum of the widths of each protuberance] / 2 R equal to 30%, at mid-height and have no angle with respect to the radial plane.
• FIG. 5A shows a three-dimensional representation of the radially outer portion 8a of the protuberances 8 and its enlargement in FIG. 5B of FIG. 5A.
• the portion 8a of each protrusion 8 and the recesses 9 are adjacent to a groove 10 disposed circumferentially on the surface of the tread 4 at its axially outermost end 4a.
• the groove 10 is not interrupted in its length.
• the groove 10 has an axial width "1" along the axis YY 'may be between 2 and 10mm, and a radial height "h" along the axis ZZ' between 3 and 8mm.
• FIG. 6A also shows a three-dimensional representation of the radially outer portion 8a of the protuberances 8. Unlike FIGS. 5A and 5B, the groove 10 is interrupted. Indeed, the end 8a of the protuberances 8 and adjacent recesses 9 completely cut the groove 10 in the circumferential direction of the tire.
• FIG. 6B shows another variant of a three-dimensional representation of said radially outer portion 8a of the protuberances 8.
• the protuberance 8 partially cuts the groove 10 in the circumferential direction of the tire.
• FIGS. 7A and 7B show that the radially inner portion 8b (shown in phantom) of the protuberance 8 is spaced a thickness "d" from the radially inner portion 10b of the recess 10. This thickness "d" is less than at 2mm, and preferably less than 1mm.
• FIG. 8 shows that the radially upper end of the protuberances 8b and 8c is adjacent to the circumferential groove 10, and that the radially upper end of the protuberance 8d completely interrupts the groove 10 to join the elastomer gum rolls of the tread 4.
• This figure thus shows an embodiment of a tire according to the invention wherein each protuberance 8b, 8c is alternated with a hollow 9.
• Each of the protuberances 8b, 8c extend from point A to point E.
• the tire according to the invention is obtained after baking and molding in a baking mold in a conventional manner.
• Example 1 Sidewalk shock test
• the tires PI to P4 are different tires according to the invention.
• the protuberances of the tires PI and P4 have no angle of inclination relative to the radial direction.
• the protuberances of the tires P2 and P3 have an angle of inclination with respect to the radial direction.
• the "Angle” column corresponds to the angle that each protuberance makes with the radial direction of the tire.
• the draft angle is the angle that each end of a protuberance, as shown in Figure 4, to facilitate the demolding.
• the pitch of a protuberance is the distance that extends from the center of a first hollow to the center of a second hollow adjacent to the first.
• H (mm) is the average height of the protuberances
• 1 (mm) is the average width of the protuberances.
• R 1 is the radius of the nominal flange size
• R 2 is the radius of the hook top
• R E is the radius corresponding to the point E
• R A is the radius of the point A.
• the flange size with the reliefs include the nominal coil size as well as the height of the protuberances on the surface of the flanks.
• Table I summarizes the measurable technical characteristics of the various tires according to the invention.
• the tire mounted on a rim 6.5 J 16 and inflated to the pressure of 1.9 bar, is disposed on the front axle right of a vehicle, and supports a load of 350kg.
• the test consists of performing, at different speeds, a shock called “sidewalk shock” of the tire on a metal block of height 90 mm, at an angle of 30 ° with the block, with respect to the direction of rolling of the tire. .
• This test is performed with a control tire (without protuberance) and different tires according to the invention which comprise protrusions having or not an angle with the radial axis of the tire.
• Example 2 Sidewalk shock test
• the tires PI to P4 are different tires according to the invention.
• Table III This test was carried out under the same operating conditions as those explained in Example 1 with a rim 8.5 J 18 and a tire inflated to the pressure of 2.3 bar, all mounted on a right front axle. a vehicle, and supporting a load of 580kg.
• the results in Table IV below show the gain obtained in speed, between a control tire (result equal to 100) and the various tires according to the invention, mentioned above, before the tire puncture.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tires In General (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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ID=49667273

Family Applications (1)

Country Status (7)

Cited By (10)

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Citations (4)

Family Cites Families (13)

• 2013
  • 2013-06-28 FR FR1356249A patent/FR3007691B1/fr not_active Expired - Fee Related
• 2014
  • 2014-06-26 US US14/901,407 patent/US9987886B2/en not_active Expired - Fee Related
  • 2014-06-26 EP EP14738754.2A patent/EP3013605B1/fr not_active Not-in-force
  • 2014-06-26 BR BR112015031544A patent/BR112015031544A8/pt not_active IP Right Cessation
  • 2014-06-26 CN CN201480035764.2A patent/CN105339186B/zh active Active
  • 2014-06-26 WO PCT/EP2014/063497 patent/WO2014207093A1/fr active Application Filing
  • 2014-06-26 RU RU2016102631A patent/RU2656758C2/ru active

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